Fig. 1. Cuniculi and septal fluting in Eopolydiexodina sp. Transmitted light micrographs. Allemann collection, Permian, Iran. A: shallow tangential section parallel to coiling axis. B: Deep transverse section parallel to coiling axis. C-E: plasticine model sculptured about 1945 by M. Reichel (* 1896 - † 1984). C: Oblique peripheral view showing undivided peripheral parts of two successive chambers. Arrows point in the direction of growth. B: Proximal view showing cuniculi (arrows). C: oblique proximal view showing fluted septal face and cuniculi. ch: chamber lumen; cun: cuniculus; fus: point of fusion of subsequent septal flutes in opposing positions; s: septum; spth: spirotheca carrying a keriotheca; (Hottinger, 2006; fig. 35  CC/BY-NC-SA)
- according to Hottinger (2006):
FLUTING - (septal fluting); folding of the septa at their base in fusiform shells, as in fusulinids. The folds in consecutive septa oppose each other and may fuse at their bases, thus loosing contact with the surface of the previous whorl that is the chamber floor and consequently producing passageways parallel to the tunnel, the so-called cuniculi.
Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744
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